Author: William Edward Stone
Publisher: National Library of Canada
Published: 1988
Total Pages: 882
ISBN-13: 9780315432802
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Similar REE abundances of garnet-bearing and andalusite-bearing wall rock to gold concentrations suggests manganese metasomatism and relative enrichment in silica and aluminum in the manner of an argillic alteration, respectively. This along with andesite and rhyolite host rock and associated gold and pyrite with small base metal content, suggests initial concentration of gold in an epithermal-like hydrothermal system by boiling of a metamorphogenic fluid liberated through devolatilization of rock subsided toward synvolcanic magma during the low pressure metamorphism. Gold was subsequently moved into dilatent and discordant fractures during plutonism.